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Analog Devices Inc./Maxim Integrated MAX6865UK39D1S+T
- Part No.:
- MAX6865UK39D1S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK39D1S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,287
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Product details
Overview
The MAX6865UK39D1S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 3.9V reset threshold (±2.5%), 10ms minimum reset timeout, and integrated watchdog timer with 3.3s typical timeout. It monitors VCC, responds to manual reset (MR), and asserts active-high push-pull RESET during brownout, power-up, or watchdog expiration - used in battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6865UK39D1S+T datasheet, MAX6865UK39D1S+T pinout, MAX6865UK39D1S+T application, or MAX6865UK39D1S+T equivalent, key selection criteria include its 3.9V threshold accuracy, 10ms reset hold time, 3.3s watchdog period, immunity to sub-40µs VCC transients, and guaranteed RESET validity down to VCC = +1.1V.
Technical Context
This device integrates voltage monitoring, manual reset input (MR), and watchdog timer (WDI) in a single BiCMOS IC. The watchdog clears on any WDI edge and expires if WDI remains static >3.3s (typ), triggering a 10ms (min) reset pulse. Reset assertion occurs when VCC falls below 3.9V, MR is pulled low, or watchdog times out.
The internal reset timeout generator ensures RESET remains asserted for ≥10ms after VCC rises above 3.9V and MR deasserts. Its push-pull active-high RESET output is referenced to VCC and sinks ≤0.3V at 500µA load, enabling direct interface with µP reset inputs without external pullups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.900V ±2.5% - factory-trimmed for precise brownout detection at nominal 3.3V/3.9V rail systems |
| Supply Current | 170nA (typ) at +25°C - enables multi-year operation on coin-cell batteries in portable medical devices |
| Reset Timeout | 10ms (min) - ensures µP reset signal meets minimum assertion time requirements per JEDEC JESD84 |
| Watchdog Timeout | 3.3s (typ), S-suffix - provides robust software execution monitoring for embedded firmware loops |
| VCC Validity Range | Operates down to VCC = +1.1V - guarantees RESET assertion integrity during deep brownout conditions |
| Output Type | Push-pull active-high RESET - eliminates need for external pullup resistor and supports direct µP reset input drive |
| MR Input Logic | Active-low, internally pulled up to VCC via 10kΩ - allows momentary switch or open-drain logic interface without external components |
Pinout & Package
Package: 5-pin SOT23 (lead-free, +T suffix), footprint-compatible with industry-standard SOT23-5 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives µP reset pin high during fault; no external pullup required |
| 2 | GND | Ground reference - must be connected to system ground plane for stable reset threshold and noise immunity |
| 3 | MR | Active-low manual reset input - initiates reset when pulled low; internally pulled up to VCC (10kΩ) |
| 4 | WDI | Watchdog input - must toggle within 3.3s (typ) to prevent reset; accepts CMOS-level edges ≥150ns wide |
| 5 | VCC | Supply voltage input - monitored for reset threshold violation; bypass with 0.1µF capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in always-on wearable health monitors |
| Reset threshold accuracy | ±2.5% over -40°C to +85°C ensures reliable brownout detection across industrial temperature range |
| Watchdog immunity | Clears on any WDI edge (rising/falling) - prevents false timeouts from noise or partial firmware hangs |
| VCC transient rejection | Immune to 100mV VCC glitches ≤40µs - avoids spurious resets in electrically noisy portable environments |
| No external components | Integrated MR pullup, precision bandgap, and timeout generator eliminate BOM cost and layout area |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Monitors |
|---|---|
Use Scenario: Continuous glucose meters powered by CR2032 coin cells operating in variable ambient temperatures. IC Role / Device Role / Timing Role: Supervises 3.3V system rail, asserts RESET on brownout or firmware lockup, and validates µP startup sequence. Use Value: 170nA ICC extends battery life beyond 2 years; 3.9V threshold matches typical LDO output; 3.3s watchdog detects unresponsive sensor drivers. |
Use Scenario: Portable ECG/SpO₂ units requiring FDA-grade reliability and low-power operation. IC Role / Device Role / Timing Role: Provides fail-safe reset during battery voltage sag, manual recalibration trigger, and watchdog supervision of real-time data acquisition firmware. Use Value: Guaranteed RESET validity to VCC = +1.1V ensures deterministic behavior during end-of-battery discharge; MR input supports clinician-initiated recalibration. |
| Industrial Handheld Scanners | Smart Wearable Sensors |
Use Scenario: Rugged barcode scanners using Li-ion batteries subjected to mechanical shock and RF interference. IC Role / Device Role / Timing Role: Monitors main 3.3V rail, filters VCC transients, and forces controlled µP reboot upon communication stack hang. Use Value: 40µs glitch rejection prevents resets from motor commutation noise; push-pull RESET ensures fast rise/fall times for µP timing compliance. |
Use Scenario: Bluetooth-enabled fitness trackers with motion sensors and flash memory logging. IC Role / Device Role / Timing Role: Supervises 1.8V/3.3V dual-rail subsystems, triggers reset on sensor firmware freeze, and enables low-power sleep mode entry. Use Value: 10ms reset timeout satisfies ARM Cortex-M0+ reset timing; SOT23-5 footprint minimizes PCB area in space-constrained wristbands. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK39D1S+T | No CT pin; identical 3.9V threshold, 10ms timeout, 3.3s watchdog, and push-pull active-low RESET | Requires level-shifting or µP with active-low reset input; not drop-in for active-high designs | Select MAX6864UK39D1S+T only if target µP requires active-low reset assertion |
| TPS3836K33DBVR | Fixed 3.08V threshold, 200ms timeout, no watchdog, 1.5µA ICC - higher current, no WDI functionality | Suitable for basic power-on reset only; cannot replace watchdog-dependent safety-critical functions | Choose TPS3836K33DBVR only for cost-sensitive, non-watchdog applications where 3.08V threshold suffices |
Compared with MAX6864UK39D1S+T and TPS3836K33DBVR, the MAX6865UK39D1S+T uniquely delivers active-high RESET, 3.9V precision threshold, and integrated watchdog in ultra-low-current SOT23 - essential for portable medical devices requiring both deterministic reset polarity and firmware supervision.
Availability
MAX6865UK39D1S+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign recorders, industrial handheld scanners, and smart wearable sensors requiring stable component supply with long-term lifecycle support.
Supply support for MAX6865UK39D1S+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for power management, sensing, and interface applications in industrial, medical, and communications markets.
The MAX6854–MAX6869 family targets ultra-low-power microprocessor supervision in battery-critical systems, emphasizing nanopower operation, factory-trimmed thresholds, and integrated watchdog functionality for safety-aware firmware.
FAQ
What is the exact reset threshold voltage of the MAX6865UK39D1S+T?
The MAX6865UK39D1S+T has a factory-trimmed reset threshold of 3.900V with ±2.5% tolerance over -40°C to +85°C, corresponding to the '39' suffix in the part number per Maxim's Threshold Suffix Guide. This value is guaranteed by design and tested during production screening.
Does the MAX6865UK39D1S+T include a watchdog timer, and what is its timeout period?
Yes, the MAX6865UK39D1S+T includes a watchdog timer with a typical timeout period of 3.3 seconds, indicated by the 'S' suffix in the part number. The watchdog clears on any rising or falling edge at the WDI pin and expires only if WDI remains static beyond this period.
What type of reset output does the MAX6865UK39D1S+T provide, and how is it configured?
The MAX6865UK39D1S+T provides an active-high push-pull RESET output, meaning it drives the RESET pin high during fault conditions. This eliminates the need for an external pullup resistor and directly interfaces with µPs requiring active-high reset assertion.
What is the minimum reset timeout period for the MAX6865UK39D1S+T, and how is it selected?
The MAX6865UK39D1S+T has a fixed minimum reset timeout period of 10ms, denoted by the 'D1' suffix. This value is factory-programmed and not user-selectable; it ensures sufficient assertion time for µP initialization per JEDEC standards.
How does the MAX6865UK39D1S+T handle short VCC transients, and what is its immunity limit?
The MAX6865UK39D1S+T is immune to VCC transients ≤40µs in duration when the overdrive is 100mV, as characterized in the Typical Operating Characteristics. This prevents spurious resets caused by switching noise or load-dump events in portable equipment.
MAX6865UK39D1S+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.9V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 10ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK39D1S+T FAQ
1.How can I place an order for MAX6865UK39D1S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK39D1S+T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX6865UK39D1S+T reliable?
The price and inventory of MAX6865UK39D1S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK39D1S+T is usually 5 days.
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4.How is shipping managed for MAX6865UK39D1S+T?
MAX6865UK39D1S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK39D1S+T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX6865UK39D1S+T?
For technical support, including MAX6865UK39D1S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK39D1S+T requirements.
6.How does Aetrix verify that MAX6865UK39D1S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK39D1S+T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX6865UK39D1S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK39D1S+T?
All MAX6865UK39D1S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK39D1S+T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX6865UK39D1S+T part is unused and in its original packaging.
Return procedure for MAX6865UK39D1S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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